Compilare: user.cpp: In function ‘long long int det(int)’: user.cpp:38:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j,nrc; ^ user.cpp:38:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,nrc; ^ user.cpp:38:13: warning: unused variable ‘nrc’ [-Wunused-variable] int i,j,nrc; ^ user.cpp: In function ‘void read()’: user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&D); ^ user.cpp: In function ‘int main()’: user.cpp:57:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cntgcd.in","r",stdin); ^ user.cpp:58:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cntgcd.out","w",stdout); ^